CN115321787A - Efficient composite medicament suitable for dewatering bottom mud of rivers and lakes and use method thereof - Google Patents
Efficient composite medicament suitable for dewatering bottom mud of rivers and lakes and use method thereof Download PDFInfo
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- CN115321787A CN115321787A CN202210863425.XA CN202210863425A CN115321787A CN 115321787 A CN115321787 A CN 115321787A CN 202210863425 A CN202210863425 A CN 202210863425A CN 115321787 A CN115321787 A CN 115321787A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/007—Contaminated open waterways, rivers, lakes or ponds
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention provides a high-efficiency composite medicament suitable for dewatering bottom mud of rivers and lakes and a use method thereof, wherein the use method comprises the following steps: s1, preparing the following materials according to the dry weight ratio of the dry medicament to the bottom mud: cationic polyacrylamide CPAM, anionic polyacrylamide APAM, cement, lime, fly ash and slag powder; wherein, the doping amount of the cationic polyacrylamide CPAM is 0.1-0.2%, the doping amount of the anionic polyacrylamide is 0.05-0.1%, the doping amount of the cement is 2.5-5%, the doping amount of the lime is 2.5-5%, the doping amount of the fly ash is 10-20%, and the doping amount of the slag powder is 5-10%; the invention adopts different reagents to be matched for use, effectively makes up for the use defect of the traditional single flocculant and can quickly finish the flocculation and dehydration of the bottom mud.
Description
Technical Field
The invention relates to the technical field of high-water-content mud treatment, in particular to an efficient composite reagent suitable for dewatering bottom mud of rivers and lakes and a using method thereof.
Background
The dredging of shipping channels and ports and the dredging of rivers and lakes in China generate a great amount of sludge with high water content every year, and if the sludge is directly discharged on site, the sludge can cause great pollution to the environment. Therefore, it is necessary to subject it to a dehydration volume reduction treatment.
The flocculation dehydration method is widely applied to engineering practice due to the advantages of simple process, economy and high efficiency. However, with the long-term use of the flocculant, the problems of single component and narrow application range of the traditional flocculant are gradually shown. River and lake bottom mud has the characteristics of high organic matter content, high water content and small particle size, and the dewatering effect is not good enough when a single flocculating agent is used for treatment. Meanwhile, the physical and chemical properties of the river and lake bottom sludge in different areas are greatly different, and the single flocculant method cannot meet the requirement of efficient flocculation.
Disclosure of Invention
Aiming at the defects in the prior art, the first purpose of the invention is to provide a using method of a high-efficiency compound medicament suitable for dehydrating bottom mud of rivers and lakes. The invention adopts different reagents to be matched for use, effectively makes up for the use defect of the traditional single flocculant and can quickly finish the flocculation and dehydration of the bottom mud.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a use method of a high-efficiency composite reagent suitable for dewatering bottom mud of rivers and lakes is characterized by comprising the following steps: the using method comprises the following steps:
s1, preparing the following materials according to the dry weight ratio of the dry medicament to the bottom mud: cationic polyacrylamide CPAM, anionic polyacrylamide APAM, cement, lime, fly ash and slag powder; wherein, the doping amount of the cationic polyacrylamide CPAM is 0.1-0.2%, the doping amount of the anionic polyacrylamide is 0.05-0.1%, the doping amount of the cement is 2.5-5%, the doping amount of the lime is 2.5-5%, the doping amount of the fly ash is 10-20%, and the doping amount of the slag powder is 5-10%;
s2, doping a dehydration material into the bottom mud, stirring, and performing primary rapid dehydration according to the sequence of adding the cationic polyacrylamide CPAM and then adding the anionic polyacrylamide APAM;
and S3, gradually slowing down the stirring speed to stop when obvious flocs appear, and then adding cement, lime, fly ash and slag powder into the dehydrated sediment for secondary dehydration.
And further: in the step S1, the doping amount of the cationic polyacrylamide CPAM is determined according to the organic matter content of the bottom mud, and when the organic matter content is 5% -15%, the doping amount of the cationic polyacrylamide CPAM is 0.1% of the dry weight ratio of the bottom mud; when the organic matter content is higher than 15%, the doping amount of the cationic polyacrylamide CPAM is 0.2% of the dry weight ratio of the bottom mud.
And further: in the step S1, the doping amount of the anionic polyacrylamide APAM is determined according to the water content of the sediment, and when the water content of the sediment is 80-150%, the doping amount of the anionic polyacrylamide APAM is 0.1% of the dry weight ratio of the sediment; when the water content is higher than 150%, the doping amount of the anionic polyacrylamide APAM is 0.05 percent of the dry weight ratio of the bottom mud.
Further: in the step S1, the doping coefficient of the material is determined according to the content of the sticky particles of the bottom mud, and when the content of the sticky particles of the bottom mud is lower than 20%, the doping coefficient is 1; when the content of the bottom mud sticky particles is 20-40%, the doping coefficient is 1.5; when the content of the slime particles of the bottom mud is higher than 40%, the doping coefficient is 2.
Further: in the step S2, when the bottom mud is stirred and dehydrated, the pH range is preferably 5-10, the stirring speed is 300-600 r/min, and when obvious floc is formed, the stirring speed is reduced to the end.
Further: in the step S1, when the dehydration material is manufactured, the cationic polyacrylamide CPAM or the anionic polyacrylamide APAM: distilled water =1 and 200 until no particles remain in the solution, and the stirring dissolution time is not less than 30 minutes.
Further: in the step S3, the cement, the lime, the fly ash and the slag powder are added, and then the mixture is fully stirred and braised for 3-7 days until the water content of the bottom mud is close to the optimal water content.
The second purpose of the invention is to provide a high-efficiency composite reagent suitable for dewatering bottom mud of rivers and lakes, which is characterized in that: comprises cationic polyacrylamide CPAM, anionic polyacrylamide APAM, cement, lime, fly ash and slag powder.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention solves the problem of poor flocculation effect of the traditional flocculant, effectively overcomes the use defect of the traditional single flocculant by adopting different reagents for matching, is applicable to the bottom sludge with higher organic matter content, and can generally reach the water content near the optimal water content after the treatment.
The main materials (anionic polyacrylamide, cationic polyacrylamide, cement, lime, fly ash and slag) of the invention are easy to obtain and nontoxic, and have long-term use experience. The invention systematically divides the indexes of the bottom mud of rivers and lakes, can effectively select the input amount of materials according to the indexes of the properties of the bottom mud, and can quickly finish the flocculation and dehydration of the bottom mud.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the following description will be given of preferred embodiments of the present invention with reference to specific examples, but it should be understood that the present invention is not limited thereto.
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.
The use method of the high-efficiency compound medicament suitable for dewatering bottom mud of rivers and lakes comprises the following steps:
s1, preparing the following materials according to the dry weight ratio of the dry medicament to the bottom mud: cationic polyacrylamide CPAM, anionic polyacrylamide APAM, cement, lime, fly ash and slag powder; wherein, the doping amount of the cationic polyacrylamide CPAM is 0.1-0.2%, the doping amount of the anionic polyacrylamide is 0.05-0.1%, the doping amount of the cement is 2.5-5%, the doping amount of the lime is 2.5-5%, the doping amount of the fly ash is 10-20%, and the doping amount of the slag powder is 5-10%;
s2, doping a dehydration material into the bottom mud, stirring, and performing primary rapid dehydration according to the sequence of adding the cationic polyacrylamide CPAM and then adding the anionic polyacrylamide APAM;
and S3, gradually slowing down the stirring speed until stopping when obvious flocs appear, and then adding cement, lime, fly ash and slag powder into the dehydrated bottom mud for secondary dehydration.
In the step S1, the sediment in a natural state referred to by the dry weight of the sediment generally comprises three parts, i.e., solid, liquid and gas, wherein the mass of the solid is the dry weight of the sediment.
In the step S1, the doping amount of the cationic polyacrylamide CPAM is determined according to the organic matter content of the bottom mud, and when the organic matter content is 5% -15%, the doping amount of the cationic polyacrylamide CPAM is 0.1% of the dry weight ratio of the bottom mud; when the organic matter content is higher than 15%, the doping amount of the cationic polyacrylamide CPAM is 0.2% of the dry weight ratio of the bottom mud. The organic matter content of the bottom mud is determined by adopting a direct burning method, namely, after moisture is removed by using an oven at 105 ℃, the bottom mud is burned at 350-400 ℃, and the ratio of the weight lost after burning to the weight after drying is the organic matter content.
In the step S1, the doping amount of the anionic polyacrylamide APAM is determined according to the water content of the sediment, and when the water content of the sediment is 80-150%, the doping amount of the anionic polyacrylamide APAM is 0.1% of the dry weight ratio of the sediment; when the water content is higher than 150%, the doping amount of the anionic polyacrylamide APAM is 0.05 percent of the dry weight ratio of the bottom mud. The water content is the ratio of the weight of water in the bottom mud to the dry weight of the bottom mud.
In the step S1, determining the doping coefficient of the material according to the content of the sticky particles of the bottom mud, wherein when the content of the sticky particles of the bottom mud is lower than 20%, the doping coefficient is 1; when the content of the bottom mud sticky particles is 20-40%, the doping coefficient is 1.5; when the content of the slime particles of the bottom mud is higher than 40%, the doping coefficient is 2.
The clay refers to soil granules having a particle diameter of less than 0.002mm in the soil granule classification standards manufactured by International and United states department of agriculture, which are called soil clay. The soil grain classification in China mostly refers to the standard.
In the step S2, when the bottom mud is stirred and dehydrated, the pH range is preferably 5-10, the stirring speed is 300-600 r/min, and when obvious floc is formed, the stirring speed is reduced to the end.
In the step S1, when the dehydration material is manufactured, the cation polyacrylamide CPAM or the anion polyacrylamide APAM: distilled water = 1.
The invention also provides a high-efficiency composite medicament suitable for dewatering bottom mud of rivers and lakes, which is characterized in that: comprises cationic polyacrylamide CPAM, anionic polyacrylamide APAM, cement, lime, fly ash and slag powder.
Example one:
the property indexes of certain lake bottom sludge are as follows: the organic matter content is 14%, the water content is 200%, and the sticky particle content is 47%.
(1) According to the selection standard of the medicament, the organic matter content of the bottom mud is 14%, and 0.1% of cationic polyacrylamide CPAM is selectively added; the water content is 200%, and 0.05% of anionic polyacrylamide APAM is selectively added; the content of the sticky particles is 47 percent, and the doping coefficient of the flocculating agent is 2. The final dose was selected as 0.2% CPAM +0.1% APAM.
Preparing cationic polyacrylamide CPAM with the mass of 0.2 percent of sediment and anionic polyacrylamide APAM with the mass of 0.1 percent of sediment, mixing the mixture with distilled water according to the proportion of 1. And then adding the mixture into the bottom sediment, keeping the pH =7.6, stirring at the speed of 350 r/min, and when flocs are obviously appeared, reducing the stirring speed to 200 r/min until the completion of flocculation dehydration, wherein the water content of the bottom sediment after the flocculation is completed is 80.6%.
(2) In contrast, 0.3% anionic polyacrylamide APAM was used to mix with distilled water at a ratio of 1. Therefore, under the same conditions, the effect of adding the cationic polyacrylamide CPAM and the anionic polyacrylamide APAM for dehydration is far better than the effect of adding the anionic polyacrylamide APAM alone.
And (2) taking out the flocculated bottom mud in the step (1), adding 2.5%, 10% and 5% of the bottom mud by mass according to the cement, lime, fly ash and slag powder, adding the primarily dewatered bottom mud, and performing secondary solidification dewatering to realize rapid dewatering and volume reduction. After the dehydration is finished, the water content of the bottom mud is 23.6 percent, and the dehydration effect is better.
And (3) taking out the flocculated bottom mud obtained in the step (2), and performing filter pressing on the bottom mud by a filter pressing method (the used machine is a plate-and-frame machine) so as to perform subsequent dehydration steps (adding cement, lime, fly ash and slag powder for secondary solidification and dehydration).
According to the description of the invention, the high-efficiency compound medicament suitable for dehydrating the river and lake bottom mud and the use method thereof can be easily manufactured or used by the technical personnel in the field, and can produce the positive effects recorded in the invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (7)
1. The use method of the high-efficiency compound medicament suitable for dewatering river and lake bottom mud is characterized by comprising the following steps of:
s1, preparing the following materials according to the dry weight ratio of the dry medicament to the bottom mud: cationic polyacrylamide CPAM, anionic polyacrylamide APAM, cement, lime, fly ash and slag powder; wherein, the doping amount of the cationic polyacrylamide CPAM is 0.1-0.2%, the doping amount of the anionic polyacrylamide APAM is 0.05-0.1%, the doping amount of the cement is 2.5-5%, the doping amount of the lime is 2.5-5%, the doping amount of the fly ash is 10-20%, and the doping amount of the slag powder is 5-10%;
s2, doping a dehydration material into the bottom mud, stirring, and performing primary rapid dehydration according to the sequence of adding the cationic polyacrylamide CPAM and then adding the anionic polyacrylamide APAM;
and S3, gradually slowing down the stirring speed to stop when obvious flocs appear, and then adding cement, lime, fly ash and slag powder into the dehydrated sediment for secondary dehydration.
2. The use method of the high-efficiency compound medicament suitable for dewatering river and lake bottom mud, according to claim 1, is characterized in that: in the step S1, the doping amount of the cationic polyacrylamide CPAM is determined according to the organic matter content of the bottom mud, and when the organic matter content is 5% -15%, the doping amount of the cationic polyacrylamide CPAM is 0.1% of the dry weight ratio of the bottom mud; when the organic matter content is higher than 15%, the doping amount of the cationic polyacrylamide CPAM is 0.2% of the dry weight ratio of the bottom mud.
3. The use method of the high-efficiency compound medicament suitable for dewatering river and lake bottom mud according to claim 1 is characterized in that: in the step S1, the doping amount of the anionic polyacrylamide APAM is determined according to the water content of the sediment, and when the water content of the sediment is 80-150%, the doping amount of the anionic polyacrylamide APAM is 0.1% of the dry weight ratio of the sediment; when the water content is higher than 150%, the doping amount of the anionic polyacrylamide APAM is 0.05 percent of the dry weight ratio of the bottom mud.
4. The use method of the high-efficiency compound medicament suitable for dewatering river and lake bottom mud according to claim 1 is characterized in that: in the step S1, the doping coefficient of the material is determined according to the content of the sticky particles of the bottom mud, and when the content of the sticky particles of the bottom mud is lower than 20%, the doping coefficient is 1; when the content of the bottom mud sticky particles is 20-40%, the doping coefficient is 1.5; when the content of the slime particles of the bottom mud is higher than 40%, the doping coefficient is 2.
5. The use method of the high-efficiency compound medicament suitable for dewatering river and lake bottom mud according to claim 1 is characterized in that: in the step S2, when the bottom mud is stirred and dehydrated, the pH range is preferably 5-10, the stirring speed is 300-600 r/min, and when obvious flocs are formed, the stirring speed is reduced to the end.
6. The use method of the high-efficiency compound medicament suitable for dewatering river and lake bottom mud, according to claim 1, is characterized in that: in the step S1, when the dehydration material is manufactured, the cation polyacrylamide CPAM or the anion polyacrylamide APAM: distilled water =1 and 200 until no particles remain in the solution, and the stirring dissolution time is not less than 30 minutes.
7. The high-efficiency composite medicament suitable for dewatering bottom mud of rivers and lakes is characterized in that: comprises cationic polyacrylamide CPAM, anionic polyacrylamide APAM, cement, lime, fly ash and slag powder.
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| CN202210863425.XA CN115321787A (en) | 2022-07-21 | 2022-07-21 | Efficient composite medicament suitable for dewatering bottom mud of rivers and lakes and use method thereof |
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| CN202210863425.XA CN115321787A (en) | 2022-07-21 | 2022-07-21 | Efficient composite medicament suitable for dewatering bottom mud of rivers and lakes and use method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57113900A (en) * | 1980-12-29 | 1982-07-15 | Kurita Water Ind Ltd | Method and device for control of sludge dehydration |
| CN106865951A (en) * | 2017-03-16 | 2017-06-20 | 中国科学院武汉岩土力学研究所 | A kind of agent of river and lake silt deep dehydration and dewatering |
| CN109081538A (en) * | 2018-09-06 | 2018-12-25 | 福州大学 | A kind of river bottom mud curing method implemented based on liquid limit index |
| CN111302589A (en) * | 2020-04-22 | 2020-06-19 | 南京环境集团有限公司 | Efficient dewatering method for urban construction waste slurry |
-
2022
- 2022-07-21 CN CN202210863425.XA patent/CN115321787A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57113900A (en) * | 1980-12-29 | 1982-07-15 | Kurita Water Ind Ltd | Method and device for control of sludge dehydration |
| CN106865951A (en) * | 2017-03-16 | 2017-06-20 | 中国科学院武汉岩土力学研究所 | A kind of agent of river and lake silt deep dehydration and dewatering |
| CN109081538A (en) * | 2018-09-06 | 2018-12-25 | 福州大学 | A kind of river bottom mud curing method implemented based on liquid limit index |
| CN111302589A (en) * | 2020-04-22 | 2020-06-19 | 南京环境集团有限公司 | Efficient dewatering method for urban construction waste slurry |
Non-Patent Citations (1)
| Title |
|---|
| 平冈正胜: "污泥处理工程学", 华东化工学院出版社 * |
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